B1-Free Space Propagation

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⌘ Background: Wave Propagation

⌘ Task: Plane wave propagation

Assume a plane wave: . Show that

What is the relation between a plane wave and an omnidirectional wave?

⌘ Free space propagation

develop propagation equation, see (http://www.antenna-theory.com/basics/friis.php)

• convert into dB
• provide examples for f = 10 MHz, 1 GHz, 100 GHz
• discuss influences on radiation pattern

Free space attenuation

⌘Comments

Free space propagation from a transmit (t) to a receive (r) station.

Calculation of free space attenuation. Note the increased free-space attenuation of approx 5 dB from 900 to 1800 Unik/MHz, and a further increase of 3 dB from 1800 (GSM 1800) to 2450 Unik/MHz (802.11b). Note also that increasing the distance by a factor of 10 will increase the power requirements by 20 dB.

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